Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: stroboscope 'instrument producing quickly flashing light' (19-21 centuries), from Greek strobos 'going around quickly' + English -scope (as in telescope)

strobe light

 noun
     
strobe light also strobe [countable]
TPE a light that flashes on and off very quickly, often used in places where you can dance
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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